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Effect of Seed Size and Density on Near-Infrared Transmittance Analysis of Corn and Soybeans

Charles R. Hurburgh, Jr., Yanfang Wu, and Juraj Siska

Soybean physical and chemical properties changed by size (from 4.8-mm to 8.8-mm diameter) but soybean size and seed density did not affect the protein and oil determination accuracy of three near-infrared transmission analyzers. Corn samples were also separated by size and kernel density. Changes in corn kernel density and size introduced small errors in near-infrared transmission protein, oil, and starch measurements. In corn protein, the maximum error was about ± 0.2% pts. A robust calibration set is needed to eliminate the weak seed weight and density effects, as well as to support the corn density calibration for near-infrared analyzers.